1. Department of Research and Development, Division of Emergencies and Critical Care , Oslo University Hospital , Oslo , Norway
2. Institute of Clinical Medicine, University of Oslo , Oslo , Norway
3. Department of Psychology, Faculty of Social Sciences , University of Oslo , Oslo , Norway
4. Department of Pain Management and Research, Division of Emergencies and Critical Care , Oslo University Hospital , Oslo , Norway
5. Health Services Research Unit , Akershus University Hospital , Lørenskog , Norway
6. Department of Obstetrics and Gynecology , Akershus University Hospital , Lørenskog , Norway
7. Oslo Centre of Biostatistics and Epidemiology, Faculty of Medicine , University of Oslo , Oslo , Norway
8. Department of Chronic Diseases and Ageing , National Institute of Public Health , Oslo , Norway
9. Department for Infant Mental Health , Regional Center for Child and Adolescent Mental Health, Eastern and Southern Norway , Oslo , Norway